In his ruminations on the recent election results, Ben Stein includes these thoughts:

"It is the mark of a
genuinely great campaign that Romney and Ryan did not back down one inch on the
main moral issue of our time, the mass murders of the unborn. This is the
primary evil of our era and it may take years to make things better, but as the
saying goes, that Dr. King used to say, “Truth forever on the scaffold, wrong
forever on the throne, yet that scaffold holds the future and beyond that dark
enclosure standeth God, within the shadow, keeping watch upon his own”
(paraphrased for this occasion). You can call it anything you want, but
abortion is a wicked evil and we will never be what we should be as long as we
treat is as a right. No one has the right to choose to kill an innocent human
being."

UPDATE: David Buysse points out that Dr. King's favored quote is drawn from "The Present Crisis" (c. 1844) by James Russell Lowell:

Careless seems the great Avenger; history's pages but record
One death-grapple in the darkness 'twixt old systems and the Word;
Truth forever on the scaffold, Wrong forever on the throne,—
Yet that scaffold sways the future, and, behind the dim unknown,
Standeth God within the shadow, keeping watch above his own.